Joist structure



c. LAMBERT JOIST STRUCTURE June 13, 1939.

Filed May 7, 1938 2 Sheets-Sheet l fluew/m @am 226 .u zome z/ I June 13', 1939. c, LAMBERT 2,162,559

JOIST STRUCTURE Filed May '7, 1938 2 Sheets-Sheet 2 Patented June 13, 1939 UNITED STATES PATENT" OFFICE 1 Claim.

This invention relates to joist structures especially the type used in building construction for supporting floors or porches.

One object of my invention is the provision of a simple joist structure which is rigid, strong, durable, and which provides advantages in strength over the common structure used at the present time.

Another object of my invention is the provision of a joist structure which simplifies matters when it is necessary to replace the worn joist which has been attacked by the elements and which may need repair or reconstruction.

Another object of my invention is the saving of labor thru using the type of structure I have provided, and thereby preserving the original cross-sectional strength of the joist member.

A still further object of my invention is the provision of a clamping support for flooring material used in connection with the joist structure I have provided.

Other objects and advantages may become apparent from the accompanying drawings and the ensuing description, in which like characters are used to designate like parts and in which;

Fig. 1 is an isometric view showing a joist structure as used at present to support a porch connected to a building or any other similar structure.

Fig. 2 shows an isometric view of my invention in conjunction with the supporting member and means of attachment.

Fig. 3 is a transversal cross-sectional view on the line 33 of Figure 2.

Fig. 4 is an isometric view of my invention isolated from any structure and other parts which do not comprise my invention.

Fig. 5 is an isometric View of a modified form of my invention.

Fig. 6 is an isometric view of a modified form of my invention as used in connection with joist and flooring material.

Fig. 7 is a longitudinal cross-sectional view on the line 1-1 of Figure 6.

Fig. 8 is an isometric view of my clamp invention used in connection with flooring material, showing the structural material in phantom.

Referring to Figure l, I show the customary manner, in which joists are usually secured, and

which has been the established practice, in order to aid in better distinguishing my invention from the type of joist structure that I have improved. It will be noticed that the joist members 9 are spliced and bolted together by a lap joint indicated at H1, in order to provide the proper height necessary dependent on the number of stories a structure is to be built.

It will be noticed that the joist member 9 at the base portion where the porch is to be constructed, is notched out as at H in order to receive a flooring member l2, which is bolted to the joist member 9. Slightly below this notched portion II is an angularly notched portion I 3 to receive a cross supporting joist member indicated by the numeral l4 and bevelled to a suit- 10:

The joist l4 supports a number of flooring cross 151 beams designated by 12, over which the flooring proper designated by I! is laid. It will be noticed particularly at the portion of the joist 9 where it is notched out at II and at l3 that it is subject to attack by the elements and consid- 20 erable weakness is the result of this common method of construction, in addition to which the joist itself. becomes subjected to more serious deterioration than it would ordinarily receive. The remaining weakened flank ll does not only 2 weaken the original cross-sectional breaking factor of safety of the joist member 9, but it also invites moisture and such other damaging elements to accumulate thereby eventually snapping or breaking the supporting joist 9. 30

So much for the common method of construction that is being employed at this time, and now I will attempt to point out the advantages to be derived by the use of my construction as exemplified in Figure 2 and more particularly 35 in Figure 4.

By referring to Figure 4, I provide a channel member of suitable length designated at 15, having a U shaped portion 23 and bolt holes 22. It is provided at convenient points within the space 40 23 with suitable supporting ledges 24 which may be welded or otherwise secured to the inner channel of the member l5. At the outer portion or surface I5 is attached a piece of angle iron designated by the numeral l8 and secured by 45 bolts or rivets l9 to the aforesaid member I5.

As will be noticed at Figure 2 the outer beam i2 is supported on this angle iron member I8, and bolted by bolts 20. The upper joist member 9 is supported on the upper ledge 24 and the 50 lower joist 9 abuts its top end against the under portion of the lower ledge 24 whereas the cross member i6 is supported in between the two ledges designated at 24 thereby making a compact arrangement requiring no cutting, cham- 55 fering or weakening of the joist members to any extent whatsoever. By virtue of the U shaped cross-section of the member [5, a flashing or protection is provided against rain, sleet, ice etc., which have a tendency to get in thru the end grain of joists thereby causing rotting and. such other decomposition as is usually attributable, from the exposure of wood or similar material, to the elements.

In Figure 5 I have a modified form of my invention which is primarily made up of two rectangular metal pieces designated by 25 and connected by welding or some other suitable process with the ledges 26 spaced as indicated at 29 and 30 on the view. The holes 3| are provided for bolting the respective joist members I6 and 9. It will be noticed that in this particular construction, the joist member I6 protrudes or projects beyond the front portion of my invention, and extends as indicated at W in order to support the first cross beam I2, thereby eliminating the use of the angle iron construction which isneoessary in the embodiment shown in Figure 4.

Referring to Figure 6 I show once-again the use of my invention the preferred form shown in Figure 4, except that instead of using a wooden joist member I6 I use a standard channel construction designated by 32. Because I am using this channel member 32 it becomes imperative that I provide the additional structure 33 shown in Figure-8 for supporting the cross beam members designated by I2. a general U shaped member designated 33 having a U shaped opening 35 with holes 36 for attaching and bolting therethru the member M. It is also provided with a bent extension as shown at 31 in order to fit ov-er one of the sides of the channel 38. The members 34 are provided to .house This structure comprises snugly the beam 12 to which they are bolted. An additional extension is shown at 39 which lodges firmly against the bottom of the U portion of the channel to stabilize the clamp and provide a uniform mounting and rigid structure.

Altho I have illustrated preferred forms of the invention it will be apparent to those skilled in the art that this invention is not limited to such forms, and that I reserve the right to all modifications and alterations which may be made without departing from the spirit of the invention or from the scope of the subjoined claim.

Having thus described my invention what I claim as new and desire to secure by Letters Pateat is:

A porch structure comprising in combination, a U shaped tie-member having at least two ledges and adapted to receive and hold securely two joist members in collinear and spaced relationship, also adapted to receive a channel supporting beam intertrnediately between the ends of the said collinearly spaced joists, a ledge secured to said U shaped tie-member for supporting, endwise, a flooring beam, a numb-er of beam supporting members, each such member comprising a U shaped beam rholding portion adapted to hold securely a flooring beam, said U shaped beam supporting member adapted to fit slidably on the said channel supporting beam by virtue of a curved lip portion engaging one side of the said channel supporting beam, said U shaped beam supporting member provided with a steadying lug POItiOIlrdiSPOSf-id oppositely to said curved lip portion, and bearing snugly against the bottom portion of the said channel supporting beam, and a number of :flooring beams secured to said U shaped'beam supporting members.

CHARLES LOUIS LAMBERT. 

